I know about the S2, I have one myself. I am not sure if this is a "samsung feature" or a stock ICS feature. If it is an ICS feature, then it should be possible to dim or turn off those lights on the ONE S also in one way or another? The best solution would be to switch them off permanently.
I have no use for those lights since I know where the three buttons are.
And the fact that they light up, full blast, and stay lit, when I watch movies via Mirage (Air Video client) in bed is just annoying at best.